-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 I do fuzz testing with trinity (latest git version) a stable 32 bit Gentoo Linux user mode linux image. The host is a stable 32 bit vanilla 3.12.7 kernel, the guest runs latest git tree + 2 patches (attached). The trinity call in the UML guest is : $> trinity -q -l off -N 10000 -C 2 -x move_pages -x mremap -v /mnt/ramdisk After a while there's no progress on the command line seen at the host system - the trinity process seems to just hangs/idling. When this does occur I cannot longer ssh into the system. The system however runs furthermore. In another terminal I still see the output of this command: $> ssh root@trinity "tail -f /var/log/messages" That's why I do know that the system does not hang completely. The output of top at the host system gives me the pid of the linux exe. A gdb call gives for that pid : $ date; sudo gdb /home/tfoerste/devel/linux/linux 25224 -n -batch -ex 'bt full' Sat Jan 11 11:36:47 CET 2014 warning: Could not load shared library symbols for linux-gate.so.1. Do you need "set solib-search-path" or "set sysroot"? 0xb7800424 in __kernel_vsyscall () #0 0xb7800424 in __kernel_vsyscall () No symbol table info available. #1 0x083d63ff in __nanosleep_nocancel () No symbol table info available. #2 0x0807266c in idle_sleep (nsecs=602496380195307520) at arch/um/os-Linux/time.c:183 ts = {tv_sec = 0, tv_nsec = 8436602} #3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208 No locals. #4 0x080a8971 in cpu_idle_loop () at kernel/cpu/idle.c:98 No locals. #5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140 No locals. #6 0x084215e9 in rest_init () at init/main.c:402 pid = -516 __func__ = "rest_init" #7 0x080487e1 in start_kernel () at init/main.c:656 command_line = 0x85b8400 "earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con0=fd:0,fd:1 con=pts rootfstype=ext4 root=98:0" #8 0x08049e42 in start_kernel_proc (unused=0x0) at arch/um/kernel/skas/process.c:48 pid = -516 __func__ = "start_kernel_proc" #9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129 fn = 0x0 #10 0x00000000 in ?? () No symbol table info available. Please note that BUG_ON was not triggered. For completeness here are the gdb traces from all linux processes currently running at the host: $ pgrep linux | xargs -n1 -I {} sudo gdb /home/tfoerste/devel/linux/linux {} -n -batch -ex 'bt' warning: process 1613 is already traced by process 25224 ptrace: Operation not permitted. /home/tfoerste/1613: No such file or directory. No stack. warning: process 21849 is already traced by process 25224 ptrace: Operation not permitted. /home/tfoerste/21849: No such file or directory. No stack. warning: Could not load shared library symbols for linux-gate.so.1. Do you need "set solib-search-path" or "set sysroot"? 0xb7800424 in __kernel_vsyscall () #0 0xb7800424 in __kernel_vsyscall () #1 0x083d63ff in __nanosleep_nocancel () #2 0x0807266c in idle_sleep (nsecs=602496380205307520) at arch/um/os-Linux/time.c:183 #3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208 #4 0x080a8971 in cpu_idle_loop () at kernel/cpu/idle.c:98 #5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140 #6 0x084215e9 in rest_init () at init/main.c:402 #7 0x080487e1 in start_kernel () at init/main.c:656 #8 0x08049e42 in start_kernel_proc (unused=0x0) at arch/um/kernel/skas/process.c:48 #9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129 #10 0x00000000 in ?? () warning: process 25231 is a cloned process warning: Could not load shared library symbols for linux-gate.so.1. Do you need "set solib-search-path" or "set sysroot"? 0xb7800424 in __kernel_vsyscall () #0 0xb7800424 in __kernel_vsyscall () #1 0x083da446 in syscall () #2 0x0806e861 in io_getevents (events=, ctx_id=, min_nr=, nr=, timeout=) at arch/um/os-Linux/aio.c:49 #3 aio_thread (arg=0x0) at arch/um/os-Linux/aio.c:109 #4 0x083db56e in clone () warning: process 25232 is a cloned process warning: Could not load shared library symbols for linux-gate.so.1. Do you need "set solib-search-path" or "set sysroot"? 0xb7800424 in __kernel_vsyscall () #0 0xb7800424 in __kernel_vsyscall () #1 0x083d82c2 in __read_nocancel () #2 0x0806f3ff in read (__nbytes=, __buf=, __fd=) at /usr/include/bits/unistd.h:44 #3 os_read_file (fd=-512, buf=0xfffffe00, len=-512) at arch/um/os-Linux/file.c:253 #4 0x0806bafc in io_thread (arg=0x0) at arch/um/drivers/ubd_kern.c:1482 #5 0x083db56e in clone () warning: process 25233 is a cloned process warning: Could not load shared library symbols for linux-gate.so.1. Do you need "set solib-search-path" or "set sysroot"? 0xb7800424 in __kernel_vsyscall () #0 0xb7800424 in __kernel_vsyscall () #1 0x083d9132 in __poll_nocancel () #2 0x08071114 in poll (__timeout=, __nfds=, __fds=) at /usr/include/bits/poll2.h:46 #3 write_sigio_thread (unused=0x0) at arch/um/os-Linux/sigio.c:61 #4 0x083db56e in clone () warning: process 25234 is a zombie - the process has already terminated ptrace: Operation not permitted. /home/tfoerste/25234: No such file or directory. No stack. ... Please Cc: me I'm not subscribed. - -- MfG/Sincerely Toralf Förster pgp finger print:1A37 6F99 4A9D 026F 13E2 4DCF C4EA CDDE 0076 E94E -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iF4EAREIAAYFAlLRISQACgkQxOrN3gB26U54pwD9Eq49Oog5KpSC4+e19t4HG6LA 5d3Oz4/qq98wCb+rF9UA/0j+fT4xjdHbYmLtc8Z0wctVO3DjdQG49/+n81s/gLx3 =eP08 -----END PGP SIGNATURE-----